Definitions of Get Behind:

Examples: He had gotten behind in his classes because he was always absent.If you get behind in your training, you won’t be ready for the competition.

2. To not make payments on time.

Examples: The creditors kept calling because she had gotten behind in her payments. Make sure you don’t get behind in your bills.

3. To move to the back of a person or thing.

Examples: When you are walking side-by-side on the sidewalk, it is common courtesy for one person to get behind the other to allow other people to pass. I was driving when another car got behind me, and started flashing his high beams.

4. To support someone or something.

Examples: People all around the world got behind the Occupy Movement. The investors would only get behind him if he gave them 25 percent plus royalties.